Sure, I’ll go find it and edit it into this comment. Have you seen Matt’s video on his ammo box gasifier?
Matt found a better way to make his nozzles without needing to cut threads on the nozzle pipe.
He uses the 1" couple and puts in a 1" to 3/4" reducer bushing. He then takes a 3/4" pipe and cuts slits in the end so it fits a 1/2" pipe easily. When you thread the 3/4" pipe into the coupler it bites down on the 1/2" pipe to hold it down. This way you can swap them out quickly and take the whole nozzle assembly out without needing to dive into the barrel. Removes from outside.